SI88644ED-AS

Overview

The SI88644ED-AS is a four-channel digital isolator from Skyworks Solutions, housed in a 24-SOIC package. It supports unidirectional data transmission at speeds up to 100 Mb/s with a propagation delay of 18 ns and pulse width distortion of 4.5 ns. The device operates on a supply voltage between 3 V and 5.5 V, drawing 11 mA of operating current. It provides 5000 Vrms isolation voltage and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrates a fully integrated secondary sensing feedback-controlled DC-DC converter for high-speed isolation
• Provides robust common-mode transient immunity rated at 40 kV/µs
• Features unidirectional signal paths across all four channels without shutdown functionality

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing high-voltage safety barriers
• Power electronics interfaces for motor control applications

Procurement Notes

Verify the specific suffix 'AS' against official Skyworks documentation to confirm pinout and electrical characteristics match your design requirements. Ensure compatibility with the 24-SOIC footprint and validate thermal performance for the intended operating environment. Cross-reference datasheet revisions to ensure no functional changes have occurred since initial publication.

Selection Notes

Select this component when high-speed unidirectional isolation is required alongside an integrated power converter. The 24-SOIC package suits surface-mount assembly processes. Consider the 125°C maximum operating temperature for demanding industrial environments. Verify that the 100 Mb/s data rate meets system timing constraints and that the 5000 Vrms isolation rating satisfies safety standards.

Part Context

This part belongs to the Si88x4x series of CMOS digital isolators. These devices combine high-speed signal isolation with integrated DC-DC conversion, eliminating the need for external isolated power supplies. The series is designed for applications requiring reliable data transmission across isolation barriers in noisy electrical environments.

Replacement Considerations

The SI88644ED-IS is a documented variant within the same family. Verify if the 'IS' suffix indicates differences in packaging or qualification status compared to the 'AS' version before substitution.